Question

1. Which cells are likely to have a higher cellular water potential?

A. Sieve-tube elements near source tissues

B. Sieve-tube elements near sink tissues

2. What type of plant would be least affected by the loss of the guard cell function that closes stomata?

A. A desert plant.

B. A poisonous plant.

C. A carnivorous plant.

D. A plant from the plains of the American midwest.

E. A rainforest plant.

I chose A poisonous plant, but it was the incorrect answer.

3. Based on the fact that CO₂ limits photosynthesis in some current environments, what might you conclude about the evolution of photosynthesis?

A. Photosynthesis evolved when environmental concentrations of CO₂ were low.

B. CO₂ levels likely did not have a bearing on the evolution of photosynthesis.

C. Photosynthesis evolved in a greenhouse.

D. Photosynthesis evolved when environmental concentrations of CO₂ were high.

4. You are working with a scientist to classify new plants. You find a new plant that has flowers. You can conclude what about its reproduction?

A. It reproduces by apomixis.

B. We do not have sufficient information about this plant to indicate how it reproduces.

C. It reproduces by somatic embryogenesis.

D. It reproduces sexually.

5. The water potential of a flaccid cell you are studying is –1.5. What is its solute potential?

A. –1.5

B. –0.5

C. 0.5

D. 1

E. 1.5

6. A turgid cell that you are studying has a solute potential of −1.3MPa. What is its approximate water potential?

A. 1.3

B. −1.3

C. −2.3

D. −0.3

E. 0.3

Answer 1